Two-cycle gas engine



Nov. 6 1923.

H. M. POST ET AL TWO-CYCLE GAS ENGINE Filed June 23, 192 1 SSheets-Sheet l 72% I Jg;l 19

HET MPUET LE1: [11 0GT Nov. 6 1923. ,473,535

H. M. POST ET AL TWO- CYCLE GAS ENGINE Filed June 23. 1921 B'Sheecs-fiheet 2 JLE- EL HargyMFmsT LE|:1 ELI-305T H. M. POST ET AL 'TWO Nov. 6 1923.

CYCLE GAS ENGINE Filed June 2:5, 1921 5 Sheets-Sheet a Harr1 .;M-FD5T LED JCLPUET mentor Patented No... 6, 1923.

UNITED STATES PATENT OFFICE.-

EARRY M. POST AND LEO 0. POST, DE LOS ANGELES, CALIFORNIA, ASSIGNORS OF ONE- THIRD T0 MACK M. SWAIN, OF LOS ANGELES, CALIFORNIA.

TWO-CYCLE GAS ENGINE.

Application filed June 23, 1921. Serial No. 479,864.

To a whom it may concern:

Be it known that we, HARRY M. Pos'r and LEO O. Posr citizens of the United States, residing at 0s Angeles, in the county of Los Angeles, State of California, have invented certain new and useful Improvements in Two-Cycle Gas Engines, ofwhich the following is a specification:

This invention relates to internal combustion engines of the two cycle type and the primary object of the invention is to provide an internal combustion engine embodying a novel cylinder construction, a novel piston construction, and a, novel arrangement of inlet and outlet ways in the cylinder construction, the cylinder, piston and ways forming an improved novel means for sucking in and compressing the charge and for delivering the same to the firing chamber. 7

Another object of the invention is to provide a novel cylinder construction embodying a compressing and firing chamber, an

intake chamber, ways connecting the chambers together, an inlet way for the intake chamber and outlet ways for the firing chamber, the cylinder having reciprocably mounted therein a piston embodying a reduced intake portion mountedin the intake chamber and enlarged body portion mounted in the firing chamber and forming the firing piston.

A further object of the invention is to provide a novel timing mechanism for closing the circuit through the spark plug arranged in the firing chamber embodying means arranged on the fly wheel to engage an adjustable contact roller carried by the engine. said means eliminating all complicated timing gears and the like.

A further object of the invention isv to provide an improved two cycle engine of the above character, which will be durable and eflicient in use, one that is simple and easy to operate and one which can be manufactured and placed upon the market at a reasonable cost. V

lVith these and other objects in view, the invention consists in the novel contruction, arrangement and formation of parts, as will be hereinafter more specifically,

Fig. 1 is a vertical section through the improved engine, showing the piston at the end of its up or compressing stroke.

Fig. 2 is a similar view showing the piston. atthe end of its down or firing or suction stroke.

F 3 1s a similar view showing the piston on its downward or firing and intake stroke, part of the engine being broken away to disclose the novel timing mechamsm.

Fig. 4 is a detail transverse section taken. on the line 1% of Figure 3.

' Fig. 5 .is a detail transverse section through the engine illustrating the novel timing roller carried .by the engine'for engaging, the contact part carried by the fly wheel.

Fig. 6 is an enlarged fragmentary section through a portion of the cylinder illustrating the type of check valve utilized in the ways formed therein.

Referring to the drawing in detail, wherein similar reference characters desig nate corresponding parts throughout the several views, the letter A indicates the imor multiple cylinder type. As shown only one cylinder has been disclosed, but in actual use, the engine will be of the multiple cylinder type with three, six, nine or more cylinders.

The engine A as shown includes the crank case B, the cylinder C, the piston D reciprocably mounted in the cylinder, the crank and connecting mechanism E, and the novel timing mechanism F.

The crank case B may be of any preferred construction or type and as shown includes the substantial cylindrical body 10 having its upper end open as at 11-for communication with the cylinder C and provided with attaching lugs 12.

The cylinder'C is of novel construction and may be either of the water or air cooled type, but as shown, the mainv portion of the cylinder is provided with water chambers 13. The cylinder C includes the main body portion 14; having the firing and compressing chamber 15 therein and the reduced upward extension 16 having the intake chamber 17 arranged therein. These. chambers 15 and 17 are connected together as clearly shown in Figures 1 to?) of the 80 proved engine, which may be of the single drawings. At the point of connection of the chambers 15 and 17, the cylinder G is pro vided with an annular thickened portion or shoulder 18, which constitutes the firing head. The cylinder at one .side is provided with the vertically extending inlet way 19 which opens out through one side of the cylinder as at 20 for connectlon w1th the ordinary inlet pipe or manifold. The

upper end of the way 19 communicates with the upper end of the intake chamber 1'? and has arranged therein the inlet check valve 21. The check valve is so disposed, that upon the suction stroke, the charge will be sucked into the chamber 17 through the valve, but on the compression stroke,

the valve will close and be forced on its seat.

' The cylinder C diametrically opposite the way 19 is provided with an outlet longitu dinally extending way 22. The lower end of this way communicates with the chamber 15 adjacent to its upper end. As shown the lower end of the way 22 is spaced slightly from the firing head 18, for apurpose, which will be hereinafter more fully described. The lower end of the way also has arranged therein a suitable outlet check valve 23.

The upper end of the way 22 communi-- cates with the upper end of the chamber 17 as at 24, at a point diametrically opposite the upper end of the way 19. The cylinder tions 25 and 26 are provided with compression piston rings 27, while the lower end of the portion 25 is fprovided with an oil piston ring 28. By re erring to'the drawings, it

can be seen that the relatively long intake portion 26 is reciprocably mounted within the chamber 17, while the portion 25 is reciprocably mounted in the chamber 15 and these portions of the piston are adapted to snugly engage the inner surface of the chambers formed in the cylinder. It is to be also noted that the intake portion 26 of the piston is relatively longer than the main or firing portion 25 of the piston.

If so desired the upper portion of the intake portion of the piston may be provided with suitable oil ports in order to effecber 17. 7

The lower end of the cylinder C is provided with suitable attaching flanges or ears 30, which are attached to the lugs 12 by suitable anchor bolts 31.

The crank and piston connection is of the usual or any preferred character and includes the connectin rod 32, which has its upper end connected in the usual or any preferred manner to the wrist pin 33, which is carried by the firing portion 25 of the piston The lower portlon of the connecting rod 32'is connected in the ordinary manner,

as at 34 with the crank arm 35 of the crank shaft 36. The crank shaft 36 is also supported in any preferred manner and has keyed. or otherwise secured thereto the fly wheel 37.

The timin mechanism F is of novel construction and embodies the spark plug 38, which is fitted in the ordinary manner, in the socket 39 formed in the cylinder C adjacent to the upper end of the firing chamber 15 thereof. The timing mechanism includes a rotatable and sliding contact roller 40, which is preferably formed of copper or some other electric conducting material. This roller 40 is carried by a fork 41, the stem 42 of which is adjustably carried by a transversely positioned sliding bracket 43. The stem 42 is insulated from the sliding bracket 43, by suitable insulating sleeve 44.

As shown the stem 42 is held in place by suitable nuts and washers 45, which'also constitutes the means for connecting the electric conductingwire thereto, as will be hereinafter more fully described. The bracket 43 includes an upper and lower face plates 46 which are held in spaced position, by a spacing block 47 The plates 46 project beyond the ends of the block 47 and slidably engage suitable guide lugs 48 formed on the crank case B of the engine. The sliding bracket has suitably connected thereto an actuating rod 49 b means of which the bracket can be readi y slid on the uide lugs 48 to retard or advance the spar as will be hereinafter more apparent.

The fly wheel 37 forms the companion portion of the priming mechanism and has a portion of its periphery cut out to receive the insulating strip 50. This insulating strip is provided at one point, with a recess for receiving the conducting lug 51, which is formed on the flywheel. This lug 51 has its outer surface flush with the outer surface of the insulating strip 50. The fly wheel is suitably grounded to the engine. The post or stem 42 has connected thereto an electric conducting wire 53, by means of the nut 45, as heretobefore stated. This wire has interthe battery 55, and the spark plug 38. The

opposite end of the wire which is connected tively lubricate the side of the intake cham to the stem 42 is grounded to the engine, as J apparent, that when the contact roller 40 engages the contact lug 51, that such will be closed through the spark plug 38, causing a spark at the spark gap or electrodes thereof.

In operation of the improved engine, it can be seen that on the down stroke, that a charge will be sucked into the upper end of the chamber 17 through the inlet way 19 and that on the up stroke of the piston the charge will be forced out of the chamber 17 through the outlet way 22 and to the upper end of the chamber 15. hen the body portion of the piston rides past the check valve 23 the passage way will be closed immediately after which the charge will be fired by the spark plug. The piston is then forced down into the cylinder and the operation as just described will again take place.

lVhen the piston descends past the exhaust ports 25, the exhaust gases will escape out through the same. It can be noted that the upper portion 26 of the piston will start forcing the charge intothe lower fir ing chamber 15 before the lower piston of body portion 25 has covered the exhaust ports or ways 25.' The entrance of the fresh charge also facilitates the driving out of the exploded charge.

From the foregoing description, it can be seen that an exceptionally simple and durable two cycle engine has been provided, in which a novel means has been provided for introducing and compressing the charge to the firing chamber.

Changes in details maybe made Without departing from the spirit or scope of the invention, but what we claim as new is,

In a. two cycle engine, a cylinder having a main firing chamber and a reduced out- L wardl extendingintake chamber, the wall of the intake chamber having a. by-pass extending therethrough and forming a communication between the upper end of the intake chamber and the upper end of the firing chamber, the wall of the inlet chamber also having an inlet passage, one end of the inlet passage opening through the outer cylindrical wall immediately adjacent the firing chamber and the'other end opening into the upper end of the intake chamber. said inlet passage extending longitudinally and tiring chamber at the completion of a predetermined length of th inward stroke, and check valves arranged in the by-pass and the inlet passage.

, HARRY M. POST.

LEO 0. POST. 

